deps/protobuf/java/compatibility_tests/v2.5.0/tests/src/main/java/com/google/protobuf/test/LazyStringArrayListTest.java
// Protocol Buffers - Google's data interchange format
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package com.google.protobuf.test;
import com.google.protobuf.*;

import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.List;

/**
 * Tests for {@link LazyStringArrayList}.
 *
 * @author dycjh@example.com (Jon Perlow)
 */
public class LazyStringArrayListTest extends TestCase {

  private static String STRING_A = "A";
  private static String STRING_B = "B";
  private static String STRING_C = "C";

  private static ByteString BYTE_STRING_A = ByteString.copyFromUtf8("A");
  private static ByteString BYTE_STRING_B = ByteString.copyFromUtf8("B");
  private static ByteString BYTE_STRING_C = ByteString.copyFromUtf8("C");

  public void testJustStrings() {
    LazyStringArrayList list = new LazyStringArrayList();
    list.add(STRING_A);
    list.add(STRING_B);
    list.add(STRING_C);

    assertEquals(3, list.size());
    assertSame(STRING_A, list.get(0));
    assertSame(STRING_B, list.get(1));
    assertSame(STRING_C, list.get(2));

    list.set(1, STRING_C);
    assertSame(STRING_C, list.get(1));

    list.remove(1);
    assertSame(STRING_A, list.get(0));
    assertSame(STRING_C, list.get(1));
  }

  public void testJustByteString() {
    LazyStringArrayList list = new LazyStringArrayList();
    list.add(BYTE_STRING_A);
    list.add(BYTE_STRING_B);
    list.add(BYTE_STRING_C);

    assertEquals(3, list.size());
    assertSame(BYTE_STRING_A, list.getByteString(0));
    assertSame(BYTE_STRING_B, list.getByteString(1));
    assertSame(BYTE_STRING_C, list.getByteString(2));

    list.remove(1);
    assertSame(BYTE_STRING_A, list.getByteString(0));
    assertSame(BYTE_STRING_C, list.getByteString(1));
  }

  public void testConversionBackAndForth() {
    LazyStringArrayList list = new LazyStringArrayList();
    list.add(STRING_A);
    list.add(BYTE_STRING_B);
    list.add(BYTE_STRING_C);

    // String a should be the same because it was originally a string
    assertSame(STRING_A, list.get(0));

    // String b and c should be different because the string has to be computed
    // from the ByteString
    String bPrime = list.get(1);
    assertNotSame(STRING_B, bPrime);
    assertEquals(STRING_B, bPrime);
    String cPrime = list.get(2);
    assertNotSame(STRING_C, cPrime);
    assertEquals(STRING_C, cPrime);

    // String c and c should stay the same once cached.
    assertSame(bPrime, list.get(1));
    assertSame(cPrime, list.get(2));

    // ByteString needs to be computed from string for both a and b
    ByteString aPrimeByteString = list.getByteString(0);
    assertEquals(BYTE_STRING_A, aPrimeByteString);
    ByteString bPrimeByteString = list.getByteString(1);
    assertNotSame(BYTE_STRING_B, bPrimeByteString);
    assertEquals(BYTE_STRING_B, list.getByteString(1));

    // Once cached, ByteString should stay cached.
    assertSame(aPrimeByteString, list.getByteString(0));
    assertSame(bPrimeByteString, list.getByteString(1));
  }

  public void testCopyConstructorCopiesByReference() {
    LazyStringArrayList list1 = new LazyStringArrayList();
    list1.add(STRING_A);
    list1.add(BYTE_STRING_B);
    list1.add(BYTE_STRING_C);

    LazyStringArrayList list2 = new LazyStringArrayList(list1);
    assertEquals(3, list2.size());
    assertSame(STRING_A, list2.get(0));
    assertSame(BYTE_STRING_B, list2.getByteString(1));
    assertSame(BYTE_STRING_C, list2.getByteString(2));
  }

  public void testListCopyConstructor() {
    List<String> list1 = new ArrayList<String>();
    list1.add(STRING_A);
    list1.add(STRING_B);
    list1.add(STRING_C);

    LazyStringArrayList list2 = new LazyStringArrayList(list1);
    assertEquals(3, list2.size());
    assertSame(STRING_A, list2.get(0));
    assertSame(STRING_B, list2.get(1));
    assertSame(STRING_C, list2.get(2));
  }

  public void testAddAllCopiesByReferenceIfPossible() {
    LazyStringArrayList list1 = new LazyStringArrayList();
    list1.add(STRING_A);
    list1.add(BYTE_STRING_B);
    list1.add(BYTE_STRING_C);

    LazyStringArrayList list2 = new LazyStringArrayList();
    list2.addAll(list1);

    assertEquals(3, list2.size());
    assertSame(STRING_A, list2.get(0));
    assertSame(BYTE_STRING_B, list2.getByteString(1));
    assertSame(BYTE_STRING_C, list2.getByteString(2));
  }
}
